61855642 has 4 divisors (see below), whose sum is σ = 92783466. Its totient is φ = 30927820.

The previous prime is 61855627. The next prime is 61855643. The reversal of 61855642 is 24655816.

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

It can be written as a sum of positive squares in only one way, i.e., 37442161 + 24413481 = 6119^2 + 4941^2 .

It is a super-2 number, since 2×61855642² = 7652240894464328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61855643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15463909 + ... + 15463912.

Almost surely, 2^61855642 is an apocalyptic number.

61855642 is a deficient number, since it is larger than the sum of its proper divisors (30927824).

61855642 is a wasteful number, since it uses less digits than its factorization.

61855642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30927823.

The product of its digits is 57600, while the sum is 37.

The square root of 61855642 is about 7864.8357897670. The cubic root of 61855642 is about 395.4817430491.

The spelling of 61855642 in words is "sixty-one million, eight hundred fifty-five thousand, six hundred forty-two".