40029665972981 has 2 divisors, whose sum is σ = 40029665972982. Its totient is φ = 40029665972980.

The previous prime is 40029665972953. The next prime is 40029665972993. The reversal of 40029665972981 is 18927956692004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21276392417956 + 18753273555025 = 4612634^2 + 4330505^2 .

It is a cyclic number.

It is not a de Polignac number, because 40029665972981 - 2²⁶ = 40029598864117 is a prime.

It is a super-2 number, since 2×40029665972981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40029665972381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20014832986490 + 20014832986491.

It is an arithmetic number, because the mean of its divisors is an integer number (20014832986491).

Almost surely, 2^{40029665972981} is an apocalyptic number.

It is an amenable number.

40029665972981 is a deficient number, since it is larger than the sum of its proper divisors (1).

40029665972981 is an equidigital number, since it uses as much as digits as its factorization.

40029665972981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117573120, while the sum is 68.

The spelling of 40029665972981 in words is "forty trillion, twenty-nine billion, six hundred sixty-five million, nine hundred seventy-two thousand, nine hundred eighty-one".