1690615447920 has 960 divisors, whose sum is σ = 6966735350400. Its totient is φ = 375506288640.

The previous prime is 1690615447909. The next prime is 1690615447933. The reversal of 1690615447920 is 297445160961.

1690615447920 is a `hidden beast` number, since 1 + 6 + 9 + 0 + 6 + 1 + 544 + 7 + 92 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1375601866 + ... + 1375603094.

It is an arithmetic number, because the mean of its divisors is an integer number (7257015990).

Almost surely, 2^{1690615447920} is an apocalyptic number.

1690615447920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1690615447920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3483367675200).

1690615447920 is an abundant number, since it is smaller than the sum of its proper divisors (5276119902480).

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

1690615447920 is a wasteful number, since it uses less digits than its factorization.

1690615447920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623 (or 1604 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 1690615447920 in words is "one trillion, six hundred ninety billion, six hundred fifteen million, four hundred forty-seven thousand, nine hundred twenty".