64961825947 has 4 divisors (see below), whose sum is σ = 64963500640. Its totient is φ = 64960151256.

The previous prime is 64961825921. The next prime is 64961825959. The reversal of 64961825947 is 74952816946.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64961825947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64961825147) 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, 777747 + ... + 857212.

It is an arithmetic number, because the mean of its divisors is an integer number (16240875160).

Almost surely, 2^64961825947 is an apocalyptic number.

64961825947 is a deficient number, since it is larger than the sum of its proper divisors (1674693).

64961825947 is a wasteful number, since it uses less digits than its factorization.

64961825947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674692.

The product of its digits is 26127360, while the sum is 61.

Subtracting 64961825947 from its reverse (74952816946), we obtain a palindrome (9990990999).

The spelling of 64961825947 in words is "sixty-four billion, nine hundred sixty-one million, eight hundred twenty-five thousand, nine hundred forty-seven".