29997928986661 has 16 divisors (see below), whose sum is σ = 32057310850560. Its totient is φ = 27986846286960.

The previous prime is 29997928986583. The next prime is 29997928986703. The reversal of 29997928986661 is 16668982979992.

It is not a de Polignac number, because 29997928986661 - 2⁷ = 29997928986533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29997928986761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015056 + ... + 7811926.

It is an arithmetic number, because the mean of its divisors is an integer number (2003581928160).

Almost surely, 2^{29997928986661} is an apocalyptic number.

It is an amenable number.

29997928986661 is a deficient number, since it is larger than the sum of its proper divisors (2059381863899).

29997928986661 is a wasteful number, since it uses less digits than its factorization.

29997928986661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800424.

The product of its digits is 22856214528, while the sum is 91.

The spelling of 29997928986661 in words is "twenty-nine trillion, nine hundred ninety-seven billion, nine hundred twenty-eight million, nine hundred eighty-six thousand, six hundred sixty-one".