61662154493 has 2 divisors, whose sum is σ = 61662154494. Its totient is φ = 61662154492.

The previous prime is 61662154453. The next prime is 61662154553. The reversal of 61662154493 is 39445126616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60387164644 + 1274989849 = 245738^2 + 35707^2 .

It is a cyclic number.

It is not a de Polignac number, because 61662154493 - 2⁶ = 61662154429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61662154453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30831077246 + 30831077247.

It is an arithmetic number, because the mean of its divisors is an integer number (30831077247).

Almost surely, 2^61662154493 is an apocalyptic number.

It is an amenable number.

61662154493 is a deficient number, since it is larger than the sum of its proper divisors (1).

61662154493 is an equidigital number, since it uses as much as digits as its factorization.

61662154493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 47.

The spelling of 61662154493 in words is "sixty-one billion, six hundred sixty-two million, one hundred fifty-four thousand, four hundred ninety-three".