661562130 has 32 divisors (see below), whose sum is σ = 1621534464. Its totient is φ = 172662656.

The previous prime is 661562129. The next prime is 661562131. The reversal of 661562130 is 31265166.

661562130 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 (661562129) and next prime (661562131).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (661562131) 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, 233187 + ... + 236006.

It is an arithmetic number, because the mean of its divisors is an integer number (50672952).

Almost surely, 2^661562130 is an apocalyptic number.

661562130 is an abundant number, since it is smaller than the sum of its proper divisors (959972334).

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

661562130 is a wasteful number, since it uses less digits than its factorization.

661562130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469250.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 661562130 is about 25720.8501025919. The cubic root of 661562130 is about 871.3451380814.

It can be divided in two parts, 66156 and 2130, that added together give a palindrome (68286).

The spelling of 661562130 in words is "six hundred sixty-one million, five hundred sixty-two thousand, one hundred thirty".