64751961947 has 2 divisors, whose sum is σ = 64751961948. Its totient is φ = 64751961946.

The previous prime is 64751961941. The next prime is 64751961949. The reversal of 64751961947 is 74916915746.

It is a happy number.

64751961947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64751961947 is a prime.

Together with 64751961949, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64751961941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32375980973 + 32375980974.

It is an arithmetic number, because the mean of its divisors is an integer number (32375980974).

Almost surely, 2^64751961947 is an apocalyptic number.

64751961947 is a deficient number, since it is larger than the sum of its proper divisors (1).

64751961947 is an equidigital number, since it uses as much as digits as its factorization.

64751961947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 59.

The spelling of 64751961947 in words is "sixty-four billion, seven hundred fifty-one million, nine hundred sixty-one thousand, nine hundred forty-seven".