61155765 has 24 divisors (see below), whose sum is σ = 115640928. Its totient is φ = 29651040.

The previous prime is 61155763. The next prime is 61155767. The reversal of 61155765 is 56755116.

It is an interprime number because it is at equal distance from previous prime (61155763) and next prime (61155767).

It is not a de Polignac number, because 61155765 - 2¹ = 61155763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61155763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61279 + ... + 62268.

It is an arithmetic number, because the mean of its divisors is an integer number (4818372).

Almost surely, 2^61155765 is an apocalyptic number.

It is an amenable number.

61155765 is a deficient number, since it is larger than the sum of its proper divisors (54485163).

61155765 is a wasteful number, since it uses less digits than its factorization.

61155765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123569 (or 123566 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 61155765 is about 7820.2151504930. The cubic root of 61155765 is about 393.9844982606.

The spelling of 61155765 in words is "sixty-one million, one hundred fifty-five thousand, seven hundred sixty-five".