136997405252578 has 16 divisors (see below), whose sum is σ = 227284676491320. Its totient is φ = 61520664312576.

The previous prime is 136997405252573. The next prime is 136997405252639. The reversal of 136997405252578 is 875252504799631.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 100761183012169 + 36236222240409 = 10037987^2 + 6019653^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 136997405252578.

It is not an unprimeable number, because it can be changed into a prime (136997405252573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71204471623 + ... + 71204473546.

It is a 2-persistent number, because it is pandigital, and so is 2⋅136997405252578 = 273994810505156, but 3⋅136997405252578 = 410992215757734 is not.

Almost surely, 2^{136997405252578} is an apocalyptic number.

136997405252578 is a deficient number, since it is larger than the sum of its proper divisors (90287271238742).

136997405252578 is a wasteful number, since it uses less digits than its factorization.

136997405252578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142408945221.

The product of its (nonzero) digits is 1143072000, while the sum is 73.

The spelling of 136997405252578 in words is "one hundred thirty-six trillion, nine hundred ninety-seven billion, four hundred five million, two hundred fifty-two thousand, five hundred seventy-eight".