161401177722 has 16 divisors (see below), whose sum is σ = 322841211840. Its totient is φ = 53793916512.

The previous prime is 161401177709. The next prime is 161401177739. The reversal of 161401177722 is 227771104161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1564878 + ... + 1664825.

It is an arithmetic number, because the mean of its divisors is an integer number (20177575740).

Almost surely, 2^161401177722 is an apocalyptic number.

161401177722 is an abundant number, since it is smaller than the sum of its proper divisors (161440034118).

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

161401177722 is a wasteful number, since it uses less digits than its factorization.

161401177722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238037.

The product of its (nonzero) digits is 32928, while the sum is 39.

The spelling of 161401177722 in words is "one hundred sixty-one billion, four hundred one million, one hundred seventy-seven thousand, seven hundred twenty-two".