161601689786 has 16 divisors (see below), whose sum is σ = 257023056960. Its totient is φ = 75989420640.

The previous prime is 161601689761. The next prime is 161601689791. The reversal of 161601689786 is 687986106161.

It is a super-2 number, since 2×161601689786² (a number of 23 digits) contains 22 as substring.

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, 15515510 + ... + 15525921.

It is an arithmetic number, because the mean of its divisors is an integer number (16063941060).

Almost surely, 2^161601689786 is an apocalyptic number.

161601689786 is a deficient number, since it is larger than the sum of its proper divisors (95421367174).

161601689786 is a wasteful number, since it uses less digits than its factorization.

161601689786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31041589.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The spelling of 161601689786 in words is "one hundred sixty-one billion, six hundred one million, six hundred eighty-nine thousand, seven hundred eighty-six".