61611550 has 96 divisors (see below), whose sum is σ = 153990144. Its totient is φ = 17712000.

The previous prime is 61611541. The next prime is 61611551. The reversal of 61611550 is 5511616.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61611551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49435 + ... + 50665.

It is an arithmetic number, because the mean of its divisors is an integer number (1604064).

Almost surely, 2^61611550 is an apocalyptic number.

61611550 is an abundant number, since it is smaller than the sum of its proper divisors (92378594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61611550 is a wasteful number, since it uses less digits than its factorization.

61611550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274 (or 1269 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 61611550 is about 7849.3025167845. The cubic root of 61611550 is about 394.9608464102.

The spelling of 61611550 in words is "sixty-one million, six hundred eleven thousand, five hundred fifty".