661265514 has 48 divisors (see below), whose sum is σ = 1763379072. Its totient is φ = 174399264.

The previous prime is 661265509. The next prime is 661265519. The reversal of 661265514 is 415562166.

661265514 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661265509) and next prime (661265519).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661265519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200214 + ... + 203489.

It is an arithmetic number, because the mean of its divisors is an integer number (36737064).

Almost surely, 2^661265514 is an apocalyptic number.

661265514 is an abundant number, since it is smaller than the sum of its proper divisors (1102113558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661265514 is a wasteful number, since it uses less digits than its factorization.

661265514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403731 (or 403728 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 661265514 is about 25715.0833947705. The cubic root of 661265514 is about 871.2148940554.

The spelling of 661265514 in words is "six hundred sixty-one million, two hundred sixty-five thousand, five hundred fourteen".