661498308 has 36 divisors (see below), whose sum is σ = 1744823808. Its totient is φ = 210912240.

The previous prime is 661498307. The next prime is 661498309. The reversal of 661498308 is 803894166.

It is an interprime number because it is at equal distance from previous prime (661498307) and next prime (661498309).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×661498308² = 875160022973725728, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (661498301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 398628 + ... + 400283.

It is an arithmetic number, because the mean of its divisors is an integer number (48467328).

Almost surely, 2^661498308 is an apocalyptic number.

It is an amenable number.

661498308 is an abundant number, since it is smaller than the sum of its proper divisors (1083325500).

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

661498308 is a wasteful number, since it uses less digits than its factorization.

661498308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798944 (or 798939 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 661498308 is about 25719.6094060544. The cubic root of 661498308 is about 871.3171171416.

The spelling of 661498308 in words is "six hundred sixty-one million, four hundred ninety-eight thousand, three hundred eight".