61866403 has 2 divisors, whose sum is σ = 61866404. Its totient is φ = 61866402.

The previous prime is 61866391. The next prime is 61866407. The reversal of 61866403 is 30466816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61866403 - 2²⁵ = 28311971 is a prime.

It is not a weakly prime, because it can be changed into another prime (61866407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30933201 + 30933202.

It is an arithmetic number, because the mean of its divisors is an integer number (30933202).

Almost surely, 2^61866403 is an apocalyptic number.

61866403 is a deficient number, since it is larger than the sum of its proper divisors (1).

61866403 is an equidigital number, since it uses as much as digits as its factorization.

61866403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 61866403 is about 7865.5198811013. The cubic root of 61866403 is about 395.5046756501.

The spelling of 61866403 in words is "sixty-one million, eight hundred sixty-six thousand, four hundred three".