40172997547 has 2 divisors, whose sum is σ = 40172997548. Its totient is φ = 40172997546.

The previous prime is 40172997523. The next prime is 40172997581. The reversal of 40172997547 is 74579927104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40172997547 - 2¹⁵ = 40172964779 is a prime.

It is a super-2 number, since 2×40172997547² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40172697547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20086498773 + 20086498774.

It is an arithmetic number, because the mean of its divisors is an integer number (20086498774).

Almost surely, 2^40172997547 is an apocalyptic number.

40172997547 is a deficient number, since it is larger than the sum of its proper divisors (1).

40172997547 is an equidigital number, since it uses as much as digits as its factorization.

40172997547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4445280, while the sum is 55.

The spelling of 40172997547 in words is "forty billion, one hundred seventy-two million, nine hundred ninety-seven thousand, five hundred forty-seven".