60661621 has 2 divisors, whose sum is σ = 60661622. Its totient is φ = 60661620.

The previous prime is 60661583. The next prime is 60661639. The reversal of 60661621 is 12616606.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37380996 + 23280625 = 6114^2 + 4825^2 .

It is a cyclic number.

It is not a de Polignac number, because 60661621 - 2⁹ = 60661109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 60661621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (60661681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30330810 + 30330811.

It is an arithmetic number, because the mean of its divisors is an integer number (30330811).

Almost surely, 2^60661621 is an apocalyptic number.

It is an amenable number.

60661621 is a deficient number, since it is larger than the sum of its proper divisors (1).

60661621 is an equidigital number, since it uses as much as digits as its factorization.

60661621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 60661621 is about 7788.5570550648. The cubic root of 60661621 is about 392.9204840993.

The spelling of 60661621 in words is "sixty million, six hundred sixty-one thousand, six hundred twenty-one".