264400551 has 8 divisors (see below), whose sum is σ = 391704560. Its totient is φ = 176267016.

The previous prime is 264400529. The next prime is 264400573. The reversal of 264400551 is 155004462.

It is an interprime number because it is at equal distance from previous prime (264400529) and next prime (264400573).

It is not a de Polignac number, because 264400551 - 2²¹ = 262303399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 9792613 = 264400551 / (2 + 6 + 4 + 4 + 0 + 0 + 5 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264400501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4896280 + ... + 4896333.

It is an arithmetic number, because the mean of its divisors is an integer number (48963070).

Almost surely, 2^264400551 is an apocalyptic number.

264400551 is a deficient number, since it is larger than the sum of its proper divisors (127304009).

264400551 is an equidigital number, since it uses as much as digits as its factorization.

264400551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9792622 (or 9792616 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 264400551 is about 16260.3982423556. The cubic root of 264400551 is about 641.8311417207.

The spelling of 264400551 in words is "two hundred sixty-four million, four hundred thousand, five hundred fifty-one".