166977277487 has 2 divisors, whose sum is σ = 166977277488. Its totient is φ = 166977277486.

The previous prime is 166977277483. The next prime is 166977277499. The reversal of 166977277487 is 784772779661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166977277487 - 2² = 166977277483 is a prime.

It is a super-2 number, since 2×166977277487² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166977277487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166977277483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83488638743 + 83488638744.

It is an arithmetic number, because the mean of its divisors is an integer number (83488638744).

Almost surely, 2^166977277487 is an apocalyptic number.

166977277487 is a deficient number, since it is larger than the sum of its proper divisors (1).

166977277487 is an equidigital number, since it uses as much as digits as its factorization.

166977277487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 348509952, while the sum is 71.

The spelling of 166977277487 in words is "one hundred sixty-six billion, nine hundred seventy-seven million, two hundred seventy-seven thousand, four hundred eighty-seven".