1691450469690 has 16 divisors (see below), whose sum is σ = 4059481127328. Its totient is φ = 451053458576.

The previous prime is 1691450469671. The next prime is 1691450469697. The reversal of 1691450469690 is 969640541961.

It is a super-2 number, since 2×1691450469690² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1691450469697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28190841132 + ... + 28190841191.

It is an arithmetic number, because the mean of its divisors is an integer number (253717570458).

Almost surely, 2^{1691450469690} is an apocalyptic number.

1691450469690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1691450469690 is an abundant number, since it is smaller than the sum of its proper divisors (2368030657638).

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

1691450469690 is a wasteful number, since it uses less digits than its factorization.

1691450469690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56381682333.

The product of its (nonzero) digits is 12597120, while the sum is 60.

The spelling of 1691450469690 in words is "one trillion, six hundred ninety-one billion, four hundred fifty million, four hundred sixty-nine thousand, six hundred ninety".