661971248 has 20 divisors (see below), whose sum is σ = 1350073560. Its totient is φ = 313565184.

The previous prime is 661971223. The next prime is 661971251. The reversal of 661971248 is 842179166.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 661971199 and 661971208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088465 + ... + 1089072.

It is an arithmetic number, because the mean of its divisors is an integer number (67503678).

Almost surely, 2^661971248 is an apocalyptic number.

It is an amenable number.

661971248 is an abundant number, since it is smaller than the sum of its proper divisors (688102312).

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

661971248 is a wasteful number, since it uses less digits than its factorization.

661971248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177564 (or 2177558 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 661971248 is about 25728.8019153633. The cubic root of 661971248 is about 871.5247178491.

The spelling of 661971248 in words is "six hundred sixty-one million, nine hundred seventy-one thousand, two hundred forty-eight".