661522134 has 64 divisors (see below), whose sum is σ = 1638572544. Its totient is φ = 173373696.

The previous prime is 661522117. The next prime is 661522153. The reversal of 661522134 is 431225166.

It is a super-2 number, since 2×661522134² = 875223067543827912, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85282 + ... + 92714.

It is an arithmetic number, because the mean of its divisors is an integer number (25602696).

Almost surely, 2^661522134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661522134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819286272).

661522134 is an abundant number, since it is smaller than the sum of its proper divisors (977050410).

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

661522134 is a wasteful number, since it uses less digits than its factorization.

661522134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7621.

The product of its digits is 8640, while the sum is 30.

The square root of 661522134 is about 25720.0725893221. The cubic root of 661522134 is about 871.3275781169.

It can be divided in two parts, 66152 and 2134, that added together give a palindrome (68286).

The spelling of 661522134 in words is "six hundred sixty-one million, five hundred twenty-two thousand, one hundred thirty-four".