64997091432 has 192 divisors, whose sum is σ = 219710050560. Its totient is φ = 16900531200.

The previous prime is 64997091409. The next prime is 64997091443. The reversal of 64997091432 is 23419079946.

64997091432 is a `hidden beast` number, since 6 + 499 + 7 + 0 + 9 + 143 + 2 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 395332 + ... + 535052.

It is an arithmetic number, because the mean of its divisors is an integer number (1144323180).

Almost surely, 2^64997091432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64997091432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109855025280).

64997091432 is an abundant number, since it is smaller than the sum of its proper divisors (154712959128).

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

64997091432 is a wasteful number, since it uses less digits than its factorization.

64997091432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139824 (or 139817 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 64997091432 in words is "sixty-four billion, nine hundred ninety-seven million, ninety-one thousand, four hundred thirty-two".