64699489947960 has 720 divisors, whose sum is σ = 268722074075400. Its totient is φ = 13918535866368.

The previous prime is 64699489947949. The next prime is 64699489947971. The reversal of 64699489947960 is 6974998499646.

64699489947960 is a `hidden beast` number, since 6 + 4 + 6 + 9 + 9 + 48 + 99 + 479 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (64699489947949) and next prime (64699489947971).

It is a Harshad number since it is a multiple of its sum of digits (90).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 45176571 + ... + 46586709.

Almost surely, 2^{64699489947960} is an apocalyptic number.

64699489947960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64699489947960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134361037037700).

64699489947960 is an abundant number, since it is smaller than the sum of its proper divisors (204022584127440).

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

64699489947960 is a wasteful number, since it uses less digits than its factorization.

64699489947960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410210 (or 1410173 counting only the distinct ones).

The product of its (nonzero) digits is 45712429056, while the sum is 90.

The spelling of 64699489947960 in words is "sixty-four trillion, six hundred ninety-nine billion, four hundred eighty-nine million, nine hundred forty-seven thousand, nine hundred sixty".