261003465 has 80 divisors (see below), whose sum is σ = 500556672. Its totient is φ = 129655296.

The previous prime is 261003409. The next prime is 261003481. The reversal of 261003465 is 564300162.

261003465 is a `hidden beast` number, since 2 + 610 + 0 + 3 + 46 + 5 = 666.

It is not a de Polignac number, because 261003465 - 2⁶ = 261003401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1149682 + ... + 1149908.

Almost surely, 2^261003465 is an apocalyptic number.

It is an amenable number.

261003465 is a deficient number, since it is larger than the sum of its proper divisors (239553207).

261003465 is a wasteful number, since it uses less digits than its factorization.

261003465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 261003465 is about 16155.6016601054. The cubic root of 261003465 is about 639.0704808854.

The spelling of 261003465 in words is "two hundred sixty-one million, three thousand, four hundred sixty-five".