161297740800 has 2112 divisors, whose sum is σ = 750031280640. Its totient is φ = 33124515840.

The previous prime is 161297740757. The next prime is 161297740811. The reversal of 161297740800 is 8047792161.

It is a happy number.

It is a super-2 number, since 2×161297740800² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3043353574 + ... + 3043353626.

Almost surely, 2^161297740800 is an apocalyptic number.

161297740800 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 161297740800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375015640320).

161297740800 is an abundant number, since it is smaller than the sum of its proper divisors (588733539840).

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

161297740800 is a wasteful number, since it uses less digits than its factorization.

161297740800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 161297740800 in words is "one hundred sixty-one billion, two hundred ninety-seven million, seven hundred forty thousand, eight hundred".