77646165455667 has 4 divisors (see below), whose sum is σ = 103528220607560. Its totient is φ = 51764110303776.

The previous prime is 77646165455609. The next prime is 77646165455689. The reversal of 77646165455667 is 76655456164677.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 77646165455667 - 2³¹ = 77644017972019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77646165455167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12941027575942 + ... + 12941027575947.

It is an arithmetic number, because the mean of its divisors is an integer number (25882055151890).

Almost surely, 2^{77646165455667} is an apocalyptic number.

77646165455667 is a deficient number, since it is larger than the sum of its proper divisors (25882055151893).

77646165455667 is a wasteful number, since it uses less digits than its factorization.

77646165455667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25882055151892.

The product of its digits is 5334336000, while the sum is 75.

The spelling of 77646165455667 in words is "seventy-seven trillion, six hundred forty-six billion, one hundred sixty-five million, four hundred fifty-five thousand, six hundred sixty-seven".