77671261266 has 32 divisors (see below), whose sum is σ = 162201061440. Its totient is φ = 24764018496.

The previous prime is 77671261219. The next prime is 77671261271. The reversal of 77671261266 is 66216217677.

It is a happy number.

It is a super-6 number, since 6×77671261266⁶ (a number of 67 digits) contains 666666 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2067301 + ... + 2104536.

It is an arithmetic number, because the mean of its divisors is an integer number (5068783170).

Almost surely, 2^77671261266 is an apocalyptic number.

77671261266 is an abundant number, since it is smaller than the sum of its proper divisors (84529800174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77671261266 is a wasteful number, since it uses less digits than its factorization.

77671261266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171978.

The product of its digits is 1778112, while the sum is 51.

The spelling of 77671261266 in words is "seventy-seven billion, six hundred seventy-one million, two hundred sixty-one thousand, two hundred sixty-six".