2661211740 has 96 divisors (see below), whose sum is σ = 8391075840. Its totient is φ = 624326400.

The previous prime is 2661211727. The next prime is 2661211741. The reversal of 2661211740 is 471121662.

It is a super-2 number, since 2×2661211740² = 14164095850227655200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2661211698 and 2661211707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661211741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44575 + ... + 85494.

It is an arithmetic number, because the mean of its divisors is an integer number (87407040).

Almost surely, 2^2661211740 is an apocalyptic number.

2661211740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661211740 is an abundant number, since it is smaller than the sum of its proper divisors (5729864100).

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

2661211740 is a wasteful number, since it uses less digits than its factorization.

2661211740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130123 (or 130121 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 2661211740 is about 51586.9338108014. The cubic root of 2661211740 is about 1385.7763444971.

The spelling of 2661211740 in words is "two billion, six hundred sixty-one million, two hundred eleven thousand, seven hundred forty".