77662161 has 24 divisors (see below), whose sum is σ = 116363520. Its totient is φ = 49860000.

The previous prime is 77662157. The next prime is 77662163. The reversal of 77662161 is 16126677.

It is not a de Polignac number, because 77662161 - 2² = 77662157 is a prime.

It is a super-2 number, since 2×77662161² = 12062822502379842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77662163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69475 + ... + 70583.

It is an arithmetic number, because the mean of its divisors is an integer number (4848480).

Almost surely, 2^77662161 is an apocalyptic number.

It is an amenable number.

77662161 is a deficient number, since it is larger than the sum of its proper divisors (38701359).

77662161 is a wasteful number, since it uses less digits than its factorization.

77662161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397 (or 1394 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 77662161 is about 8812.6137439468. The cubic root of 77662161 is about 426.6481075776.

The spelling of 77662161 in words is "seventy-seven million, six hundred sixty-two thousand, one hundred sixty-one".