661510434 has 16 divisors (see below), whose sum is σ = 1424791872. Its totient is φ = 203541648.

The previous prime is 661510411. The next prime is 661510439. The reversal of 661510434 is 434015166.

It is not an unprimeable number, because it can be changed into a prime (661510439) 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, 4240374 + ... + 4240529.

It is an arithmetic number, because the mean of its divisors is an integer number (89049492).

Almost surely, 2^661510434 is an apocalyptic number.

661510434 is an abundant number, since it is smaller than the sum of its proper divisors (763281438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661510434 is a wasteful number, since it uses less digits than its factorization.

661510434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8480921.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 661510434 is about 25719.8451395027. The cubic root of 661510434 is about 871.3224411798.

The spelling of 661510434 in words is "six hundred sixty-one million, five hundred ten thousand, four hundred thirty-four".