161637696 has 168 divisors, whose sum is σ = 512576064. Its totient is φ = 48291840.

The previous prime is 161637667. The next prime is 161637709. The reversal of 161637696 is 696736161.

161637696 is a `hidden beast` number, since 1 + 6 + 1 + 637 + 6 + 9 + 6 = 666.

It is a super-2 number, since 2×161637696² = 52253489536376832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 614461 + ... + 614723.

It is an arithmetic number, because the mean of its divisors is an integer number (3051048).

Almost surely, 2^161637696 is an apocalyptic number.

161637696 is a gapful number since it is divisible by the number (16) 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 161637696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256288032).

161637696 is an abundant number, since it is smaller than the sum of its proper divisors (350938368).

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

161637696 is a wasteful number, since it uses less digits than its factorization.

161637696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 376 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 161637696 is about 12713.6814495252. The cubic root of 161637696 is about 544.7294855918.

The spelling of 161637696 in words is "one hundred sixty-one million, six hundred thirty-seven thousand, six hundred ninety-six".