661277902 has 8 divisors (see below), whose sum is σ = 999157536. Its totient is φ = 328225392.

The previous prime is 661277887. The next prime is 661277909. The reversal of 661277902 is 209772166.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661277909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1206438 + ... + 1206985.

It is an arithmetic number, because the mean of its divisors is an integer number (124894692).

Almost surely, 2^661277902 is an apocalyptic number.

661277902 is a deficient number, since it is larger than the sum of its proper divisors (337879634).

661277902 is a wasteful number, since it uses less digits than its factorization.

661277902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413562.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 661277902 is about 25715.3242639481. The cubic root of 661277902 is about 871.2203344029.

The spelling of 661277902 in words is "six hundred sixty-one million, two hundred seventy-seven thousand, nine hundred two".