61277155506121 has 4 divisors (see below), whose sum is σ = 61359628125312. Its totient is φ = 61194682886932.

The previous prime is 61277155506031. The next prime is 61277155506187. The reversal of 61277155506121 is 12160555177216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61277155506121 - 2⁹ = 61277155505609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61277155504121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41236308481 + ... + 41236309966.

It is an arithmetic number, because the mean of its divisors is an integer number (15339907031328).

Almost surely, 2^{61277155506121} is an apocalyptic number.

It is an amenable number.

61277155506121 is a deficient number, since it is larger than the sum of its proper divisors (82472619191).

61277155506121 is an equidigital number, since it uses as much as digits as its factorization.

61277155506121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82472619190.

The product of its (nonzero) digits is 882000, while the sum is 49.

The spelling of 61277155506121 in words is "sixty-one trillion, two hundred seventy-seven billion, one hundred fifty-five million, five hundred six thousand, one hundred twenty-one".