1615651655641 has 2 divisors, whose sum is σ = 1615651655642. Its totient is φ = 1615651655640.

The previous prime is 1615651655531. The next prime is 1615651655671. The reversal of 1615651655641 is 1465561565161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243216080016 + 372435575625 = 1114996^2 + 610275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1615651655641 - 2¹¹ = 1615651653593 is a prime.

It is a super-2 number, since 2×1615651655641² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1615651655671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 807825827820 + 807825827821.

It is an arithmetic number, because the mean of its divisors is an integer number (807825827821).

Almost surely, 2^{1615651655641} is an apocalyptic number.

It is an amenable number.

1615651655641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1615651655641 is an equidigital number, since it uses as much as digits as its factorization.

1615651655641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240000, while the sum is 52.

The spelling of 1615651655641 in words is "one trillion, six hundred fifteen billion, six hundred fifty-one million, six hundred fifty-five thousand, six hundred forty-one".