661370782 has 16 divisors (see below), whose sum is σ = 1038098592. Its totient is φ = 315675360.

The previous prime is 661370779. The next prime is 661370783. The reversal of 661370782 is 287073166.

It is a super-2 number, since 2×661370782² = 874822622566583048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661370783) 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, 80394 + ... + 88237.

It is an arithmetic number, because the mean of its divisors is an integer number (64881162).

Almost surely, 2^661370782 is an apocalyptic number.

661370782 is a deficient number, since it is larger than the sum of its proper divisors (376727810).

661370782 is a wasteful number, since it uses less digits than its factorization.

661370782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168723.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 661370782 is about 25717.1301276017. The cubic root of 661370782 is about 871.2611216706.

The spelling of 661370782 in words is "six hundred sixty-one million, three hundred seventy thousand, seven hundred eighty-two".