666157436 has 24 divisors (see below), whose sum is σ = 1354899840. Its totient is φ = 280656432.

The previous prime is 666157421. The next prime is 666157501. The reversal of 666157436 is 634751666.

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, 199970 + ... + 203273.

It is an arithmetic number, because the mean of its divisors is an integer number (56454160).

Almost surely, 2^666157436 is an apocalyptic number.

It is an amenable number.

666157436 is an abundant number, since it is smaller than the sum of its proper divisors (688742404).

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

666157436 is a wasteful number, since it uses less digits than its factorization.

666157436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403313 (or 403311 counting only the distinct ones).

The product of its digits is 544320, while the sum is 44.

The square root of 666157436 is about 25810.0258814283. The cubic root of 666157436 is about 873.3579810977.

The spelling of 666157436 in words is "six hundred sixty-six million, one hundred fifty-seven thousand, four hundred thirty-six".