161974733886 has 192 divisors, whose sum is σ = 441459072000. Its totient is φ = 43772037120.

The previous prime is 161974733839. The next prime is 161974733909. The reversal of 161974733886 is 688337479161.

161974733886 is a `hidden beast` number, since 1 + 619 + 7 + 4 + 7 + 3 + 3 + 8 + 8 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 36144766 + ... + 36149246.

It is an arithmetic number, because the mean of its divisors is an integer number (2299266000).

Almost surely, 2^161974733886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161974733886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220729536000).

161974733886 is an abundant number, since it is smaller than the sum of its proper divisors (279484338114).

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

161974733886 is a wasteful number, since it uses less digits than its factorization.

161974733886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244 (or 5231 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 161974733886 in words is "one hundred sixty-one billion, nine hundred seventy-four million, seven hundred thirty-three thousand, eight hundred eighty-six".