77775252646 has 48 divisors (see below), whose sum is σ = 146191046400. Its totient is φ = 30759402240.

The previous prime is 77775252617. The next prime is 77775252647. The reversal of 77775252646 is 64625257777.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77775252647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6107566 + ... + 6120286.

It is an arithmetic number, because the mean of its divisors is an integer number (3045646800).

Almost surely, 2^77775252646 is an apocalyptic number.

77775252646 is a deficient number, since it is larger than the sum of its proper divisors (68415793754).

77775252646 is a wasteful number, since it uses less digits than its factorization.

77775252646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17549 (or 17542 counting only the distinct ones).

The product of its digits is 34574400, while the sum is 58.

The spelling of 77775252646 in words is "seventy-seven billion, seven hundred seventy-five million, two hundred fifty-two thousand, six hundred forty-six".