661601254 has 16 divisors (see below), whose sum is σ = 999702000. Its totient is φ = 328375264.

The previous prime is 661601203. The next prime is 661601267. The reversal of 661601254 is 452106166.

It is a congruent number.

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, 198897 + ... + 202195.

It is an arithmetic number, because the mean of its divisors is an integer number (62481375).

Almost surely, 2^661601254 is an apocalyptic number.

661601254 is a deficient number, since it is larger than the sum of its proper divisors (338100746).

661601254 is a wasteful number, since it uses less digits than its factorization.

661601254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 661601254 is about 25721.6106416375. The cubic root of 661601254 is about 871.3623145156.

The spelling of 661601254 in words is "six hundred sixty-one million, six hundred one thousand, two hundred fifty-four".