70137031681 has 2 divisors, whose sum is σ = 70137031682. Its totient is φ = 70137031680.

The previous prime is 70137031567. The next prime is 70137031693. The reversal of 70137031681 is 18613073107.

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., 68517774081 + 1619257600 = 261759^2 + 40240^2 .

It is an emirp because it is prime and its reverse (18613073107) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70137031681 - 2¹⁵ = 70136998913 is a prime.

It is a super-2 number, since 2×70137031681² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 70137031681.

It is not a weakly prime, because it can be changed into another prime (70137031781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35068515840 + 35068515841.

It is an arithmetic number, because the mean of its divisors is an integer number (35068515841).

Almost surely, 2^70137031681 is an apocalyptic number.

It is an amenable number.

70137031681 is a deficient number, since it is larger than the sum of its proper divisors (1).

70137031681 is an equidigital number, since it uses as much as digits as its factorization.

70137031681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The spelling of 70137031681 in words is "seventy billion, one hundred thirty-seven million, thirty-one thousand, six hundred eighty-one".