70667551 has 2 divisors, whose sum is σ = 70667552. Its totient is φ = 70667550.

The previous prime is 70667549. The next prime is 70667561. The reversal of 70667551 is 15576607.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 70667551 - 2¹ = 70667549 is a prime.

Together with 70667549, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 70667551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70667501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35333775 + 35333776.

It is an arithmetic number, because the mean of its divisors is an integer number (35333776).

Almost surely, 2^70667551 is an apocalyptic number.

70667551 is a deficient number, since it is larger than the sum of its proper divisors (1).

70667551 is an equidigital number, since it uses as much as digits as its factorization.

70667551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 70667551 is about 8406.3994075942. The cubic root of 70667551 is about 413.4344674626.

The spelling of 70667551 in words is "seventy million, six hundred sixty-seven thousand, five hundred fifty-one".