64777487492 has 12 divisors (see below), whose sum is σ = 113366009820. Its totient is φ = 32387198976.

The previous prime is 64777487491. The next prime is 64777487519. The reversal of 64777487492 is 29478477746.

It can be written as a sum of positive squares in 2 ways, for example, as 11131516036 + 53645971456 = 105506^2 + 231616^2 .

It is a super-2 number, since 2×64777487492² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64777487491) 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, 289133 + ... + 461684.

It is an arithmetic number, because the mean of its divisors is an integer number (9447167485).

Almost surely, 2^64777487492 is an apocalyptic number.

It is an amenable number.

64777487492 is a deficient number, since it is larger than the sum of its proper divisors (48588522328).

64777487492 is a wasteful number, since it uses less digits than its factorization.

64777487492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772390 (or 772388 counting only the distinct ones).

The product of its digits is 132765696, while the sum is 65.

The spelling of 64777487492 in words is "sixty-four billion, seven hundred seventy-seven million, four hundred eighty-seven thousand, four hundred ninety-two".