71647620251 has 2 divisors, whose sum is σ = 71647620252. Its totient is φ = 71647620250.

The previous prime is 71647620227. The next prime is 71647620257. The reversal of 71647620251 is 15202674617.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71647620251 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71647620199 and 71647620208.

It is not a weakly prime, because it can be changed into another prime (71647620257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35823810125 + 35823810126.

It is an arithmetic number, because the mean of its divisors is an integer number (35823810126).

Almost surely, 2^71647620251 is an apocalyptic number.

71647620251 is a deficient number, since it is larger than the sum of its proper divisors (1).

71647620251 is an equidigital number, since it uses as much as digits as its factorization.

71647620251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 71647620251 in words is "seventy-one billion, six hundred forty-seven million, six hundred twenty thousand, two hundred fifty-one".