660764237421 has 8 divisors (see below), whose sum is σ = 881026358400. Its totient is φ = 440505804032.

The previous prime is 660764237257. The next prime is 660764237429. The reversal of 660764237421 is 124732467066.

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

It is a cyclic number.

It is not a de Polignac number, because 660764237421 - 2²⁶ = 660697128557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660764237429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472500 + ... + 1242893.

It is an arithmetic number, because the mean of its divisors is an integer number (110128294800).

Almost surely, 2^660764237421 is an apocalyptic number.

It is an amenable number.

660764237421 is a deficient number, since it is larger than the sum of its proper divisors (220262120979).

660764237421 is a wasteful number, since it uses less digits than its factorization.

660764237421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843795.

The product of its (nonzero) digits is 2032128, while the sum is 48.

The spelling of 660764237421 in words is "six hundred sixty billion, seven hundred sixty-four million, two hundred thirty-seven thousand, four hundred twenty-one".