82779555649 has 8 divisors (see below), whose sum is σ = 95489368128. Its totient is φ = 70290783600.

The previous prime is 82779555641. The next prime is 82779555653. The reversal of 82779555649 is 94655597728.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82779555649 - 2³ = 82779555641 is a prime.

It is a super-2 number, since 2×82779555649² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82779555641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55259302 + ... + 55260799.

It is an arithmetic number, because the mean of its divisors is an integer number (11936171016).

Almost surely, 2^82779555649 is an apocalyptic number.

It is an amenable number.

82779555649 is a deficient number, since it is larger than the sum of its proper divisors (12709812479).

82779555649 is a wasteful number, since it uses less digits than its factorization.

82779555649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110520215.

The product of its digits is 190512000, while the sum is 67.

The spelling of 82779555649 in words is "eighty-two billion, seven hundred seventy-nine million, five hundred fifty-five thousand, six hundred forty-nine".