660262421 has 16 divisors (see below), whose sum is σ = 824767104. Its totient is φ = 514603584.

The previous prime is 660262417. The next prime is 660262433. The reversal of 660262421 is 124262066.

It is a cyclic number.

It is not a de Polignac number, because 660262421 - 2² = 660262417 is a prime.

It is a super-3 number, since 3×660262421³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660262411) 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, 48050 + ... + 60243.

It is an arithmetic number, because the mean of its divisors is an integer number (51547944).

Almost surely, 2^660262421 is an apocalyptic number.

It is an amenable number.

660262421 is a deficient number, since it is larger than the sum of its proper divisors (164504683).

660262421 is a wasteful number, since it uses less digits than its factorization.

660262421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108380.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 660262421 is about 25695.5720115354. The cubic root of 660262421 is about 870.7741473345.

The spelling of 660262421 in words is "six hundred sixty million, two hundred sixty-two thousand, four hundred twenty-one".