161437137816 has 256 divisors, whose sum is σ = 453570969600. Its totient is φ = 47645452800.

The previous prime is 161437137809. The next prime is 161437137821. The reversal of 161437137816 is 618731734161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 106840501 + ... + 106842011.

It is an arithmetic number, because the mean of its divisors is an integer number (1771761600).

Almost surely, 2^161437137816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161437137816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226785484800).

161437137816 is an abundant number, since it is smaller than the sum of its proper divisors (292133831784).

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

161437137816 is a wasteful number, since it uses less digits than its factorization.

161437137816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790 (or 1786 counting only the distinct ones).

The product of its digits is 508032, while the sum is 48.

The spelling of 161437137816 in words is "one hundred sixty-one billion, four hundred thirty-seven million, one hundred thirty-seven thousand, eight hundred sixteen".