65278390397 has 8 divisors (see below), whose sum is σ = 71917867872. Its totient is φ = 58756426000.

The previous prime is 65278390393. The next prime is 65278390517. The reversal of 65278390397 is 79309387256.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65278390397 - 2² = 65278390393 is a prime.

It is a super-2 number, since 2×65278390397² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65278390393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29377103 + ... + 29379324.

It is an arithmetic number, because the mean of its divisors is an integer number (8989733484).

Almost surely, 2^65278390397 is an apocalyptic number.

It is an amenable number.

65278390397 is a deficient number, since it is larger than the sum of its proper divisors (6639477475).

65278390397 is a wasteful number, since it uses less digits than its factorization.

65278390397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58756539.

The product of its (nonzero) digits is 17146080, while the sum is 59.

The spelling of 65278390397 in words is "sixty-five billion, two hundred seventy-eight million, three hundred ninety thousand, three hundred ninety-seven".