65561378 has 8 divisors (see below), whose sum is σ = 100740780. Its totient is φ = 31981120.

The previous prime is 65561359. The next prime is 65561383. The reversal of 65561378 is 87316556.

It can be written as a sum of positive squares in 2 ways, for example, as 60575089 + 4986289 = 7783^2 + 2233^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399683 + ... + 399846.

Almost surely, 2^65561378 is an apocalyptic number.

65561378 is a deficient number, since it is larger than the sum of its proper divisors (35179402).

65561378 is a wasteful number, since it uses less digits than its factorization.

65561378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799572.

The product of its digits is 151200, while the sum is 41.

The square root of 65561378 is about 8096.9980857105. The cubic root of 65561378 is about 403.2267707158.

The spelling of 65561378 in words is "sixty-five million, five hundred sixty-one thousand, three hundred seventy-eight".