61235401553 has 2 divisors, whose sum is σ = 61235401554. Its totient is φ = 61235401552.

The previous prime is 61235401547. The next prime is 61235401589. The reversal of 61235401553 is 35510453216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45152850064 + 16082551489 = 212492^2 + 126817^2 .

It is a cyclic number.

It is not a de Polignac number, because 61235401553 - 2¹⁰ = 61235400529 is a prime.

It is not a weakly prime, because it can be changed into another prime (61235401543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30617700776 + 30617700777.

It is an arithmetic number, because the mean of its divisors is an integer number (30617700777).

Almost surely, 2^61235401553 is an apocalyptic number.

It is an amenable number.

61235401553 is a deficient number, since it is larger than the sum of its proper divisors (1).

61235401553 is an equidigital number, since it uses as much as digits as its factorization.

61235401553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 61235401553 its reverse (35510453216), we get a palindrome (96745854769).

The spelling of 61235401553 in words is "sixty-one billion, two hundred thirty-five million, four hundred one thousand, five hundred fifty-three".