220025661 has 4 divisors (see below), whose sum is σ = 293367552. Its totient is φ = 146683772.

The previous prime is 220025657. The next prime is 220025669. The reversal of 220025661 is 166520022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220025661 - 2² = 220025657 is a prime.

It is a super-2 number, since 2×220025661² = 96822582996973842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220025669) 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, 36670941 + ... + 36670946.

It is an arithmetic number, because the mean of its divisors is an integer number (73341888).

Almost surely, 2^220025661 is an apocalyptic number.

It is an amenable number.

220025661 is a deficient number, since it is larger than the sum of its proper divisors (73341891).

220025661 is an equidigital number, since it uses as much as digits as its factorization.

220025661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73341890.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 220025661 is about 14833.2619811018. The cubic root of 220025661 is about 603.7045440703.

Adding to 220025661 its reverse (166520022), we get a palindrome (386545683).

The spelling of 220025661 in words is "two hundred twenty million, twenty-five thousand, six hundred sixty-one".