149940666721 has 2 divisors, whose sum is σ = 149940666722. Its totient is φ = 149940666720.

The previous prime is 149940666679. The next prime is 149940666749. The reversal of 149940666721 is 127666049941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133444090000 + 16496576721 = 365300^2 + 128439^2 .

It is an emirp because it is prime and its reverse (127666049941) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149940666721 is a prime.

It is not a weakly prime, because it can be changed into another prime (149940666221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74970333360 + 74970333361.

It is an arithmetic number, because the mean of its divisors is an integer number (74970333361).

Almost surely, 2^149940666721 is an apocalyptic number.

It is an amenable number.

149940666721 is a deficient number, since it is larger than the sum of its proper divisors (1).

149940666721 is an equidigital number, since it uses as much as digits as its factorization.

149940666721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 149940666721 in words is "one hundred forty-nine billion, nine hundred forty million, six hundred sixty-six thousand, seven hundred twenty-one".