65978751 has 8 divisors (see below), whose sum is σ = 93146544. Its totient is φ = 41398400.

The previous prime is 65978729. The next prime is 65978767. The reversal of 65978751 is 15787956.

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

It is not a de Polignac number, because 65978751 - 2⁷ = 65978623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65978751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65978701) 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, 646800 + ... + 646901.

It is an arithmetic number, because the mean of its divisors is an integer number (11643318).

Almost surely, 2^65978751 is an apocalyptic number.

65978751 is a deficient number, since it is larger than the sum of its proper divisors (27167793).

65978751 is a wasteful number, since it uses less digits than its factorization.

65978751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293721.

The product of its digits is 529200, while the sum is 48.

The square root of 65978751 is about 8122.7305138112. The cubic root of 65978751 is about 404.0806275539.

The spelling of 65978751 in words is "sixty-five million, nine hundred seventy-eight thousand, seven hundred fifty-one".