2420501661 has 12 divisors (see below), whose sum is σ = 3544175388. Its totient is φ = 1591562304.

The previous prime is 2420501651. The next prime is 2420501687. The reversal of 2420501661 is 1661050242.

It can be written as a sum of positive squares in 2 ways, for example, as 1918965636 + 501536025 = 43806^2 + 22395^2 .

It is not a de Polignac number, because 2420501661 - 2¹³ = 2420493469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2420501651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1841430 + ... + 1842743.

It is an arithmetic number, because the mean of its divisors is an integer number (295347949).

Almost surely, 2^2420501661 is an apocalyptic number.

It is an amenable number.

2420501661 is a deficient number, since it is larger than the sum of its proper divisors (1123673727).

2420501661 is a wasteful number, since it uses less digits than its factorization.

2420501661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684252 (or 3684249 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 2420501661 is about 49198.5940957666. The cubic root of 2420501661 is about 1342.6674534940.

The spelling of 2420501661 in words is "two billion, four hundred twenty million, five hundred one thousand, six hundred sixty-one".