661262415 has 32 divisors (see below), whose sum is σ = 1214956800. Its totient is φ = 303736320.

The previous prime is 661262389. The next prime is 661262419. The reversal of 661262415 is 514262166.

661262415 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661262415 - 2¹⁴ = 661246031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661262419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102330 + ... + 108599.

It is an arithmetic number, because the mean of its divisors is an integer number (37967400).

Almost surely, 2^661262415 is an apocalyptic number.

661262415 is a deficient number, since it is larger than the sum of its proper divisors (553694385).

661262415 is a wasteful number, since it uses less digits than its factorization.

661262415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210967.

The product of its digits is 17280, while the sum is 33.

The square root of 661262415 is about 25715.0231382357. The cubic root of 661262415 is about 871.2135330795.

The spelling of 661262415 in words is "six hundred sixty-one million, two hundred sixty-two thousand, four hundred fifteen".