70621166665501 has 2 divisors, whose sum is σ = 70621166665502. Its totient is φ = 70621166665500.

The previous prime is 70621166665499. The next prime is 70621166665507. The reversal of 70621166665501 is 10556666112607.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47399080320601 + 23222086344900 = 6884699^2 + 4818930^2 .

It is an emirp because it is prime and its reverse (10556666112607) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70621166665501 - 2¹ = 70621166665499 is a prime.

Together with 70621166665499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70621166665507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35310583332750 + 35310583332751.

It is an arithmetic number, because the mean of its divisors is an integer number (35310583332751).

Almost surely, 2^{70621166665501} is an apocalyptic number.

It is an amenable number.

70621166665501 is a deficient number, since it is larger than the sum of its proper divisors (1).

70621166665501 is an equidigital number, since it uses as much as digits as its factorization.

70621166665501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 70621166665501 in words is "seventy trillion, six hundred twenty-one billion, one hundred sixty-six million, six hundred sixty-five thousand, five hundred one".