661012437 has 8 divisors (see below), whose sum is σ = 905170336. Its totient is φ = 428764752.

The previous prime is 661012427. The next prime is 661012463. The reversal of 661012437 is 734210166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-661012437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661012427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2977423 + ... + 2977644.

It is an arithmetic number, because the mean of its divisors is an integer number (113146292).

Almost surely, 2^661012437 is an apocalyptic number.

It is an amenable number.

661012437 is a deficient number, since it is larger than the sum of its proper divisors (244157899).

661012437 is a wasteful number, since it uses less digits than its factorization.

661012437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5955107.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 661012437 is about 25710.1621348447. The cubic root of 661012437 is about 871.1037372000.

The spelling of 661012437 in words is "six hundred sixty-one million, twelve thousand, four hundred thirty-seven".