1691690422500 has 1215 divisors, whose sum is σ = 6264505606359. Its totient is φ = 384576192000.

The previous prime is 1691690422489. The next prime is 1691690422507. The reversal of 1691690422500 is 52240961961.

The square root of 1691690422500 is 1300650.

It is a perfect power (a square), and thus also a powerful number.

1691690422500 is a `hidden beast` number, since 1 + 6 + 9 + 16 + 90 + 42 + 2 + 500 = 666.

It can be written as a sum of positive squares in 22 ways, for example, as 1072082151396 + 619608271104 = 1035414^2 + 787152^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1691690422507) by changing a digit.

It is a polite number, since it can be written in 404 ways as a sum of consecutive naturals, for example, 58334152486 + ... + 58334152514.

Almost surely, 2^{1691690422500} is an apocalyptic number.

1691690422500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1691690422500 is the 1300650-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691690422500

1691690422500 is an abundant number, since it is smaller than the sum of its proper divisors (4572815183859).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1691690422500 is a wasteful number, since it uses less digits than its factorization.

1691690422500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 1691690422500 in words is "one trillion, six hundred ninety-one billion, six hundred ninety million, four hundred twenty-two thousand, five hundred".