15720120461 has 2 divisors, whose sum is σ = 15720120462. Its totient is φ = 15720120460.

The previous prime is 15720120413. The next prime is 15720120499. The reversal of 15720120461 is 16402102751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15679797961 + 40322500 = 125219^2 + 6350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15720120461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15720120401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7860060230 + 7860060231.

It is an arithmetic number, because the mean of its divisors is an integer number (7860060231).

Almost surely, 2^15720120461 is an apocalyptic number.

It is an amenable number.

15720120461 is a deficient number, since it is larger than the sum of its proper divisors (1).

15720120461 is an equidigital number, since it uses as much as digits as its factorization.

15720120461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 15720120461 in words is "fifteen billion, seven hundred twenty million, one hundred twenty thousand, four hundred sixty-one".