77528265950649 has 4 divisors (see below), whose sum is σ = 103371021267536. Its totient is φ = 51685510633764.

The previous prime is 77528265950591. The next prime is 77528265950669. The reversal of 77528265950649 is 94605956282577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77528265950649 - 2¹⁵ = 77528265917881 is a prime.

It is a super-2 number, since 2×77528265950649² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77528265950669) 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, 12921377658439 + ... + 12921377658444.

It is an arithmetic number, because the mean of its divisors is an integer number (25842755316884).

Almost surely, 2^{77528265950649} is an apocalyptic number.

It is an amenable number.

77528265950649 is a deficient number, since it is larger than the sum of its proper divisors (25842755316887).

77528265950649 is a wasteful number, since it uses less digits than its factorization.

77528265950649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25842755316886.

The product of its (nonzero) digits is 2286144000, while the sum is 75.

The spelling of 77528265950649 in words is "seventy-seven trillion, five hundred twenty-eight billion, two hundred sixty-five million, nine hundred fifty thousand, six hundred forty-nine".