61601572001 has 2 divisors, whose sum is σ = 61601572002. Its totient is φ = 61601572000.

The previous prime is 61601571979. The next prime is 61601572009. The reversal of 61601572001 is 10027510616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31352014225 + 30249557776 = 177065^2 + 173924^2 .

It is a cyclic number.

It is not a de Polignac number, because 61601572001 - 2¹⁰ = 61601570977 is a prime.

It is not a weakly prime, because it can be changed into another prime (61601572009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30800786000 + 30800786001.

It is an arithmetic number, because the mean of its divisors is an integer number (30800786001).

Almost surely, 2^61601572001 is an apocalyptic number.

It is an amenable number.

61601572001 is a deficient number, since it is larger than the sum of its proper divisors (1).

61601572001 is an equidigital number, since it uses as much as digits as its factorization.

61601572001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The spelling of 61601572001 in words is "sixty-one billion, six hundred one million, five hundred seventy-two thousand, one".