61497632221 has 2 divisors, whose sum is σ = 61497632222. Its totient is φ = 61497632220.

The previous prime is 61497632167. The next prime is 61497632269. The reversal of 61497632221 is 12223679416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44833404121 + 16664228100 = 211739^2 + 129090^2 .

It is a cyclic number.

It is not a de Polignac number, because 61497632221 - 2⁹ = 61497631709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61497633221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30748816110 + 30748816111.

It is an arithmetic number, because the mean of its divisors is an integer number (30748816111).

Almost surely, 2^61497632221 is an apocalyptic number.

It is an amenable number.

61497632221 is a deficient number, since it is larger than the sum of its proper divisors (1).

61497632221 is an equidigital number, since it uses as much as digits as its factorization.

61497632221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The spelling of 61497632221 in words is "sixty-one billion, four hundred ninety-seven million, six hundred thirty-two thousand, two hundred twenty-one".