61815265 has 16 divisors (see below), whose sum is σ = 79369920. Its totient is φ = 46077120.

The previous prime is 61815263. The next prime is 61815277. The reversal of 61815265 is 56251816.

It is a happy number.

It is not a de Polignac number, because 61815265 - 2¹ = 61815263 is a prime.

It is a super-2 number, since 2×61815265² = 7642253974040450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61815265.

It is not an unprimeable number, because it can be changed into a prime (61815263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462 + ... + 11128.

It is an arithmetic number, because the mean of its divisors is an integer number (4960620).

Almost surely, 2^61815265 is an apocalyptic number.

It is an amenable number.

61815265 is a deficient number, since it is larger than the sum of its proper divisors (17554655).

61815265 is a wasteful number, since it uses less digits than its factorization.

61815265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10752.

The product of its digits is 14400, while the sum is 34.

The square root of 61815265 is about 7862.2684385615. The cubic root of 61815265 is about 395.3956725275.

The spelling of 61815265 in words is "sixty-one million, eight hundred fifteen thousand, two hundred sixty-five".