61657945007 has 2 divisors, whose sum is σ = 61657945008. Its totient is φ = 61657945006.

The previous prime is 61657944979. The next prime is 61657945033. The reversal of 61657945007 is 70054975616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61657945007 - 2¹⁰ = 61657943983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61657945067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30828972503 + 30828972504.

It is an arithmetic number, because the mean of its divisors is an integer number (30828972504).

Almost surely, 2^61657945007 is an apocalyptic number.

61657945007 is a deficient number, since it is larger than the sum of its proper divisors (1).

61657945007 is an equidigital number, since it uses as much as digits as its factorization.

61657945007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 61657945007 in words is "sixty-one billion, six hundred fifty-seven million, nine hundred forty-five thousand, seven".