642551435 has 8 divisors (see below), whose sum is σ = 791901456. Its totient is φ = 500148000.

The previous prime is 642551419. The next prime is 642551447. The reversal of 642551435 is 534155246.

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

It is not a de Polignac number, because 642551435 - 2⁴ = 642551419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642551395 and 642551404.

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, 1736441 + ... + 1736810.

It is an arithmetic number, because the mean of its divisors is an integer number (98987682).

Almost surely, 2^642551435 is an apocalyptic number.

642551435 is a deficient number, since it is larger than the sum of its proper divisors (149350021).

642551435 is a wasteful number, since it uses less digits than its factorization.

642551435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473293.

The product of its digits is 72000, while the sum is 35.

The square root of 642551435 is about 25348.5982847178. The cubic root of 642551435 is about 862.9175450815.

The spelling of 642551435 in words is "six hundred forty-two million, five hundred fifty-one thousand, four hundred thirty-five".