642005554 has 16 divisors (see below), whose sum is σ = 1014436800. Its totient is φ = 303884784.

The previous prime is 642005521. The next prime is 642005579. The reversal of 642005554 is 455500246.

It is a super-2 number, since 2×642005554² = 824342262733693832, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53824 + ... + 64660.

It is an arithmetic number, because the mean of its divisors is an integer number (63402300).

Almost surely, 2^642005554 is an apocalyptic number.

642005554 is a deficient number, since it is larger than the sum of its proper divisors (372431246).

642005554 is a wasteful number, since it uses less digits than its factorization.

642005554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12417.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 642005554 is about 25337.8285178505. The cubic root of 642005554 is about 862.6731113425.

The spelling of 642005554 in words is "six hundred forty-two million, five thousand, five hundred fifty-four".