72971780107 has 2 divisors, whose sum is σ = 72971780108. Its totient is φ = 72971780106.

The previous prime is 72971780099. The next prime is 72971780111. The reversal of 72971780107 is 70108717927.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72971780107 - 2³ = 72971780099 is a prime.

It is not a weakly prime, because it can be changed into another prime (72971780117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36485890053 + 36485890054.

It is an arithmetic number, because the mean of its divisors is an integer number (36485890054).

Almost surely, 2^72971780107 is an apocalyptic number.

72971780107 is a deficient number, since it is larger than the sum of its proper divisors (1).

72971780107 is an equidigital number, since it uses as much as digits as its factorization.

72971780107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345744, while the sum is 49.

The spelling of 72971780107 in words is "seventy-two billion, nine hundred seventy-one million, seven hundred eighty thousand, one hundred seven".