161700770777 has 32 divisors (see below), whose sum is σ = 211844908800. Its totient is φ = 119843463168.

The previous prime is 161700770771. The next prime is 161700770779. The reversal of 161700770777 is 777077007161.

It is not a de Polignac number, because 161700770777 - 2⁴ = 161700770761 is a prime.

It is a super-2 number, since 2×161700770777² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161700770771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 371528 + ... + 679289.

It is an arithmetic number, because the mean of its divisors is an integer number (6620153400).

Almost surely, 2^161700770777 is an apocalyptic number.

It is an amenable number.

161700770777 is a deficient number, since it is larger than the sum of its proper divisors (50144138023).

161700770777 is a wasteful number, since it uses less digits than its factorization.

161700770777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050945.

The product of its (nonzero) digits is 705894, while the sum is 50.

The spelling of 161700770777 in words is "one hundred sixty-one billion, seven hundred million, seven hundred seventy thousand, seven hundred seventy-seven".