642675577251 has 8 divisors (see below), whose sum is σ = 876828694720. Its totient is φ = 418486422312.

The previous prime is 642675577241. The next prime is 642675577253. The reversal of 642675577251 is 152775576246.

It is a happy number.

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

It is not a de Polignac number, because 642675577251 - 2⁷ = 642675577123 is a prime.

It is a super-4 number, since 4×642675577251⁴ (a number of 48 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642675577191 and 642675577200.

It is not an unprimeable number, because it can be changed into a prime (642675577253) 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, 2490990481 + ... + 2490990738.

It is an arithmetic number, because the mean of its divisors is an integer number (109603586840).

Almost surely, 2^642675577251 is an apocalyptic number.

642675577251 is a deficient number, since it is larger than the sum of its proper divisors (234153117469).

642675577251 is a wasteful number, since it uses less digits than its factorization.

642675577251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4981981265.

The product of its digits is 24696000, while the sum is 57.

The spelling of 642675577251 in words is "six hundred forty-two billion, six hundred seventy-five million, five hundred seventy-seven thousand, two hundred fifty-one".