61603753457 has 2 divisors, whose sum is σ = 61603753458. Its totient is φ = 61603753456.

The previous prime is 61603753399. The next prime is 61603753489. The reversal of 61603753457 is 75435730616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41701315681 + 19902437776 = 204209^2 + 141076^2 .

It is a cyclic number.

It is not a de Polignac number, because 61603753457 - 2²⁸ = 61335318001 is a prime.

It is not a weakly prime, because it can be changed into another prime (61603153457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30801876728 + 30801876729.

It is an arithmetic number, because the mean of its divisors is an integer number (30801876729).

Almost surely, 2^61603753457 is an apocalyptic number.

It is an amenable number.

61603753457 is a deficient number, since it is larger than the sum of its proper divisors (1).

61603753457 is an equidigital number, since it uses as much as digits as its factorization.

61603753457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1587600, while the sum is 47.

The spelling of 61603753457 in words is "sixty-one billion, six hundred three million, seven hundred fifty-three thousand, four hundred fifty-seven".