61770155 has 4 divisors (see below), whose sum is σ = 74124192. Its totient is φ = 49416120.

The previous prime is 61770151. The next prime is 61770161. The reversal of 61770155 is 55107716.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61770155 - 2² = 61770151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61770151) 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, 6177011 + ... + 6177020.

It is an arithmetic number, because the mean of its divisors is an integer number (18531048).

Almost surely, 2^61770155 is an apocalyptic number.

61770155 is a deficient number, since it is larger than the sum of its proper divisors (12354037).

61770155 is a wasteful number, since it uses less digits than its factorization.

61770155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12354036.

The product of its (nonzero) digits is 7350, while the sum is 32.

The square root of 61770155 is about 7859.3991500623. The cubic root of 61770155 is about 395.2994684628.

The spelling of 61770155 in words is "sixty-one million, seven hundred seventy thousand, one hundred fifty-five".